Check out my handsome new preprint on the evolution of a family of juvenile hormone esterase-like proteins. We see three features of neofunctionalization: duplications, positive selection and a change in localization. On top of that, when we use a pharmacological inhibitor in vivo in the food and thus trophallactic fluid of nurse-ants rearing larvae, more of those larva survive past adulthood, showing that by regulating these esterases' activity in rearing workers, we can regulate larval development.